Telephone system



ay 1942- w. B. STRICKLER 2,283,395

TELEPHONE SYSTEM Filed Oct. 31, 1940 8 Sheets-Sheet l FIG. 7

F/GJA FIG. 44

F/GZ F/GJ FIG. 4 F/a's FIG.

FIG.

A T Tom/Er DIS TAN 1' OFFICE May 19, 1942.

w. B. STRICKLER 2,283,395

TELE'HONE SYSTEM Filed Oct. 31, 1940 8 Sheets-Sheet 2 /Nl/E N TOR 8y we.5 TR/C/(LER A T TORNEV y w. B. sTRlcKLi-zR 2,283,395

TELEPHONE SYSTEM Filed Oct. 51, 19 40. 8 Sheets-Sheet 3 INVENTOR W8.STR/C/(LER A TTOR/VEV May 19, 1942. w. B. STRICKLER 2,283,395"

TELEPHONE SYSTEM Filed ot. 51,1940 8 Sheets-Sheet4 M/l/EN TOR W. B. STR/CKLER v MSE'YMTW -A TTORNEV y I W. B. STRICKLER 2,283,395

TELEPHONE SYSTEM Filed Oct. 31, 1940 8 Sheets-Slaget 5 A r TOPNEV May19, 1942.

w. B. STRICKLER. 2,283,395

TELEPHONE SYSTEM Filed Oct. 51, 1940 8 Sheets-Sheet 6 w ENTOR 6yWBSTR/C/(LER NEW 1f A T TORNEV May 19, 1942- w. B. sTRicKLER TELEPHONESYSTEM 8 Sheets-Sheet 7 Filed Oct 51, 1940 I/Vl/E N TOR we. STR/C/(L ERA Tram/5r w. B. STRICKLER May 19;, 1942.

TELEPHONE SYSTEM Filed Oct. 31, 1940 8 Sheets-Sheet 8 mob mm. P3 N v v bNQb A T roRA/Ei Patented May 19, 1942 i TELEPHONE SYSTEM Walter B.Strickler, East Orange, N. J., assignor to Bell Telephone Laboratories,Incorporated, New York, N. Y., a corporation of New York ApplicationOctober 31,

V Claims.

This invention relates to telephone systemsand more particularly toregistering devices for automatic switching telephone ofiices.

The object of the invention is to simplify the registering system in anautomatic telephone ofiice which receives widely varying designationregistrations.

A'feature of the invention is a system of form ing differentcombinations of a plurality of vari ably operable code registers ina-registering device depending upon the number of digits in a coderesponsive to code digit pulses and in connecting the registers whichare formed into the digit registering combination with the registers ofa second registering device.

Another and related feature of the invention.

is a system of forming different combinations of said variably operablecode registers responsive to the digits comprising the code and inoperating a device cooperatively related to the combination formed forconnecting the registers so combined with the registers of a secondregistering device. r r

Another and related feature of the invention is a system of formingdifferent combinations of said variably operable registers responsivetopulses and in providing other devices selectively operable responsiveto the registers formed into a code registering combination forconnecting the code registering combination-so formed to the registersof a second registering device.

Another and related feature of the invention is a system of formingdifferent combinations of said variably operable registers dependingupon the number of digits in' a code'for controlling I the operation ofa second registering device to select different groups of trunks forassociation with the registers of said second registering dc vice.

Another and related feature of the invention is a system of registeringdigits in a registering, device having a series of registers and acircuitfor transferring a pulsing device to successive registers, inwhich said series of registers may be variably formed into combinationsusing different numbers of said registers for a first code, intransferring said first code registrations to a second registeringdevice and in registering another code on the next in order registers ofsaid series following the last register formed into the combination, andin transferring said second digit registrations to a third registeringdevice.

These and other features will be discussed more fully in the followingdescription.

To illustrate the features of the invention reiincoming sender.

1940, Serial No. 363,729

erence may be had to the accompanying draw ings in which:

Fig. 1 illustrates an office having a pulsing circuit therein, anincoming trunk circuit, a sender link and connector, and a portion of anFigs. 2, 3, 3A, 4, {1A and 5 illustrate'the remainder of the sender towhich the invention applies. Fig. 3 also diagrammatically illustrates athird sender and an outgoing pulse control circuit.

Fig. 6 illustrates a marker having code registers associated withdifferent groups of trunks and a marker connector for associating asender with this marker. 1, I r

The drawings when arranged as shown in Fig. '7 illustrate the detailedstructure ofthis registering system. i I r Generai description.

The registering system herein disclosed maybe economically employed ina. large cross-bar switching toll telephone oflice such as fully dis;

closed in the patent application of G. V..King-,

J. B. McKim-O. Myers, SerialNo. 295,010, filed September 15, 1939,issued as Patent 2,236,246,

March 25,.1941, or a system such as disclosed. in thepatent applicationof A. J. Busch and F, J. Scudder, Seral No. 295,012, filed September.15, 1939.

. The incoming senderdisclosed in Figs. 1, 2, 3,

3A, 4, 4A and 5 may beenergizedby a pulsing, circuit in a distant ofiiceor a pulsing circuit in the same oflice when required. The office indi.

I cated as I00 may be a distant toll office, a tandem oflice or othertype of office known to the art, equipped with automatic pulsingcircuits for operating registers in another office. In large tolloffices, a switchboard may be in use having pulse ing equipment forcontrolling senders of I this character for handling delayed telephonecalls. An incoming call enters an automatic switching telephone officesuch as the one disclosed herein, over trunk conductors such as I02 andI03 for actuating apparatus in an incoming trunk circuit such as I04. Asender link and connectorcircuit is diagrammatically shown forassociating the incoming trunk circuits with an automatically operablesender. For a detailed description of the energizing of the link such asI05 for asso-..

ciating an incoming trunk circuit with a sender and for the energizationof the sender inre sponse to this association, reference may be had tothe aforementioned patent application of A. J.

Busch and F. J. Scudder, Serial No. 295,012, filed September 15, 1939.

In response to theselection of a sender by a link and the association ofthis sender with an incoming trunk circuit, apparatus in the sender isenergized for associating pulse responsive equipment with the distantoifice I00. This includes common pulse responsive relays, a series ofregisters separately responsive to the pulses for each digit and relaysfor transferring the common pulse responsive relays from one registercombination to the next in successive order between digits. It has beenthe practice in telephone ofiices to employ separate senders for three,four and five-digit codes. The pulsing circuit according to thisinvention includes registers which may be variably operated for one, twoor three-digit codes on the first three registers, four-digit codesusing the first four registers and five-digit codes using thefirst fiveregisters.

These registers are combined in a manner for transferring the ofiicecode digits tothree registers in a marker which controls the selectionof an outgoing trunk to a terminating office, an outgoing trunk to adistant toll oifice or an outgoing trunk to a delayed outward tollswitchboard. The relays 500, 50! and 502 shown in Fig. 5 are madeselective by the sender registers according to the number of digits in acode which causes the operation of a particular one of these relays forassociating certain combinations of registers of Figs. 4 and 4A with thethree registers of the marker of Fig. 6. The registers of the markerhave been diagrammatically shown since the contact and wiringarrangement may be identical with that fully disclosed intheaforementioned Patent 2,236,246 to King-McKim-Myers, Serial No. 295,010,March 25, 1941.

A three-digit office call is registered on the relays of senderregisters A, B and C. Circuits are established for selecting andoperating relay 500 for connecting registers A, B and. C of the senderwith registers A, B and C of the marker of Fig. 6. When the incomingcall is to be routed through the apparatus of the toll office disclosedherein to a third toll ofilce, a second code registration is made by thetransmission of pulses from oflice I00. This second code registration isrecorded on registers D,- E and other similar registers which follow inconsecutive order. When the incoming toll call terminates in the areaofthe toll ofiice disclosed herein,.numerical digitsmay follow the threedigits registered on the registers A,.B and C; In this case, thenumerical digits are-recorded on registers D, E and other registersfollowing in consecutive order.

An arrangement of equipment and circuits is provided in the sender todetermine the number of digits-in the code being transmitted so that atthe end of the code signals, the code registers may immediately beassociated with the registers of the marker; For example, theregistration of a three-digit code on registers A, B and C, theoperation of the relays for advancing the pulsing circuit 'from oneregisterto another and the establishment'of other code determiningcircuits, energizes a starting circuit as soon as the last code.register'has been operated for immediately passing the signals to themarker registers. This circuit is established in different mannersdepending upon whether the registers are operated for athree-digit,,four-digit or five-digit code. In this manner; the'circuitsare automatically rendered responsiveat the end of the registration ofany number of digits.

As previously stated, the four-digit code energizes registers A, B, Cand D. Operation of the register A energizes a signaling circuit toindicate a four-digit code and a relay is operated in the marker toindicate that a particular group of toll trunks shall be employed forcompleting this telephone connection. The remainder of the four-digitcode is set up on registers B, C and D and in this case relay 50! isoperated to associate this combination of, code registers, B, C and Dwith registers A, B and C in the marker. A fivedigit code employs theuse of registers A, B, C, D and E. The first two registers A and Benergize signaling equipment to indicate a five-digit code and equipmentin the marker is operated to associate the marker registers with aparticular group of route relays to obtain access to a particular groupof trunks. The registration of a five-digt code energizes apparatus andassociated circuits for operating relay 502 to associate the senderregisters C, D and E with marker registers A, B and C.

A plurality of additional sender registers similar to thoseshown inFigs. 4 and 4A are used in successive order for outgoing oflice codesand numerical digits to be transferred later to other registeringdevices. As previously stated, the next in order sender registerfollowing the last sender register used for the incoming ofiice code isused for registering the outgoing office code or numerical digits. Thesender registers on which the outgoing oflice code or numerical digitsare recorded remain operated until after the first ofiice code has beenregistered in the marker and the'marker has selected an outgoing trunk.This outgoing trunk may be a completing trunk to an office within thearea of this toll ofiice or a toll trunk to a distant toll office. Toobtain the effect of incoming and outgoing pulses as recorded on thesender registers, it may be assumed that two office codes have beenregistered and that the second ofiice code is an outgoing code. If thefirst office code is a three-digit code, it is registered on the senderregisters A, B and C. This code may be assumed as a toll code which willbe transferred to a toll marker such as 620 for obtaining a trunk to aparticular distant toll oflice. The second code may be a three-digitcode which is registered on three successive registers starting withregister D. After the outgoing trunk has been selected by the markeraccording to the first code and has been connected to the distantoffice, the second code registered may be transferred to anotherregistering device, which latter code is registered in a distant ofliceand represents the trunk to be obtained in that ofiice for completing orcontinuing extension of the telephone connection.

The following detailed description explains the working of the senderequipment in forming the various combinations of registers responsive todifferent code pulses.

Detailed description An incoming trunk I04, diagrammatically shown, isselected regardless of the number of digits to be transmitted to thesender. The seizure of an incoming trunk energizes the sender link andconnector circuit I05 in order to find an idle sender and associate thissender with the calling incoming trunk. The selection of the senderenergizes relay Ml to maintain this sender busy to prevent its selectionby another link circuit energized by a different trunk. The energizationof relay Ml establishes a circuit for relay 202 which extends fromground or contact 3 of relay I4I through resistance 220, both windingsof relay 202 and through the winding of a relay known as the splittingrelay I06 in the incoming trunk circuit I04 to battery. Relay 202 isoperated in the circuit traced but the splitting relay in the trunkcircuit is not operated at this time. The operation of relay 202establishes a circuit for relay 20I. This circuit is obvious and neednot be traced. Relay 2! establishes a number of circuits by associationof ground through its contacts. A circuit for relay 204 is establishedfrom battery through its winding to ground on contact 4 of relay 20I. -Acircuit is established for relay 300 from battery through its winding toground on contact of relay 20I. Ground on contacts I and 2 of relay 20Iare connected through the link circuit to the cut-off relay in theincoming trunk (not shown) and a second relay (not shown) which opens alink control circuit. The sender has now been prepared to receivesignals over the trunk circuit conductors. The operation of relay 204establishes circuits for the pulsing relays 209 to 2I4, inclusive.Contact 4 connects battery through relays 209, 2 and 2I3, resistanceI20, contact 2 of relay 2I3, conductor I36 to the trunk circuit I04.Contact 5 connects battery through relays 2I0, 2I2 and 2M, resistanceI2I, contact 5 of relay I I3, conductor I31 to the trunk circuit I04.Battery is thus provided for signals fromthe trunk circuit which mayoperate the sender class relays for indicating the class of the call tothe sender. As soon as battery is connected through the circuit tracedby the operation of relay 204 either relay 209 or 2I0 or both of theserelays are operated to indicate the type of equipment in the sender andthe marker to be used for the incoming call. When relay 209 is operatedby a ground associated with lead I30 in the trunk, a circuit isestablished for relay I II from ground through the contact of relay 209over lead 220, contact I of relay I I3, contact 3 of relay I I I,winding of relay II I to battery. The operation of this relay indicatesthat toll completing equipment in the marker shall be selected forconnecting the incoming trunk to a trunk associated with an officewithin the area of this toll office. A ground associated with lead I3Ienergizes relay 2I0 which connects ground through its contact, contact 4of relay I I3, contact 3 of relay I I 0, winding of relay IIO tobattery. The operation of the latter relay will ultimately control theassociation of the sender with equipment in the marker for obtaining atrunk to another toll ofiice. The energization of either of the aboverelays H0 or III establishes locking circuits for themselves andwhichever relay is operated a circuit is established for relay II2. Thiscircuit may be traced from battery through the winding of relay II2through contacts 4 of either relay H0 or III to ground on either relay209 or 2I0, whichever one is operated. The operation of relay II2establishes a circuit for relay 203 from battery through the winding ofthe latter relay to ground on contact 2 of relay H2. The operation ofrelay 203 associated ground with the mid-point beresistance in thecircuit of the splitting relay in trunk circuit I04, causing itsoperation The operation of the splitting relay I06 opens leads I36 andI31, causing the release of relays 209 and 2I0 or whichever one wasoperated. This causes the operation of relay H3 in the following manner:When relay II2 was operated, its operating ground was connected throughits contact 3 over lead I30 to the left winding terminal of relay I I3.At this time, ground is also connected to the other winding terminal ofrelay I I3 over lead I3I from contact 3 of relay 204. The release ofrelay 209 or 2I0 disconnects ground from lead I30. This circuit fromground through the contacts of relays 209 and 2I0 may be traced overleads 220 and 224 through contacts I and 4 of relay II3, contacts 4 ofrelays H0 and III, contact 3 of relay II2 to the left winding terminalof relay II3. Thus the release of relays 209 and 2I0, or

whichever one was operated, causes battery to flow through the windingof relay I I2 and its contact 3, lead I30, windingof relay II3,conductor I 3I to the ground on contact 3 of relay 204. Relay I I3operates and holds relay I I2 operated. Relay H3 in operatingdisconnects the circuits extending through relays 209, 2I I, 2I3 andthrough relays 2I0, 2I2 and 2I4-from conductors I36 and I 31 whichassociated these relays with the trunk circuit.

A circuit is now prepared for operating the.

registers and for steering the pulsing leads from one register toanother after each digit has been registered by the association ofpulsing relays I09 to H4, inclusive, with the pulsing circuit in thefollowing manner. Relay II3 establishes a circuit through the windingsof relays 320 and 400 for the association of the pulsingcircuit relaycontacts with the registers. This circuit may be traced from batterythrough the winding 320, winding of relay 400, contact 5 of relay 405,contact I of relay 328, thence over lead 230 to ground on contact 3 ofrelay I I3. Relays 320 and 400 operate in the circuit traced and alocking circuit is established from battery through the windings ofthese relays,,contact 5 of relay 405, contacts 4 and-3 of relay 320 toground over the operating circuit on contact 3 of relay II3. Relay 328is also operated from battery through its'winding, contact 2 of relay320 to ground on contact-3 of relay H3. It should be noted that theoperation of relay 32B opens the original operating circuit for relays320 and 400, so that when these relays are released they will not againoperate over this circuit. The operation of relay 328 also establishes acircuit for relay III. This circuit may be traced from batteryassociated with the distant pulsing circuit over lead I40 throughcontact 3 of relay II5, contact 4 of relay H6, contact 3 and winding ofrelay II'I, contact 2 of relay 328 to ground on contact I of relay 300.The operation or relay III establishesa locking circuit for itself frombattery through resistance I23, contact 3 and winding of relay II! tothe operating ground and associates pulsing leads I39 and I40 from thedistant pulsing circuit with pulsing relays I09 to H4,

inclusive. Pulsing leads I39 and I40 extend through contacts 2 and 3 ofrelay H5, contacts 2 and 4 of relay H6, contacts I and 2 of relay II I,thence through the pulsing relays H3, 2! I, 209 to battery on contact 4of relay 204 and through the' pulsing relays 2I4, 2I2 'and 2I0 tobattery through contact 5 of relay 204.

Telephone call using three-digit code The following is given as anexampleoi recording a three-digit oflice code. The pulses transmittedover either pulse lead I33 or I40 operate either relay 209 or 2I0 forcontrolling the successive order in which the registers are operated.The pulse responsive operations of relay 2II or 2I3 over lead I39 orrelay 2I2 or 2I4 over lead I40 regulate the number of relays operated ineach register. Assuming that relay 209 is operated by a pulse over leadI 39, ground is associated through its contact with conductor 220 whichextends through contact I of relay Ii3, conductor 22I, contact I ofrelay 320, which it will be remembered is operated, winding of relay 32Ito battery. Relay 32! operates in this circuit for preparing a transferoperation as explained later. If this same pulse is of a character tooperate the pulsing relay 2 a circuit is established for the AI registerrelay 40I from ground through the contact of relay 2 over lead 222,contact I of relay 400, winding of the AI register 40l to battery,operating this register relay. If the pulse was of a character tooperate pulsing relay 2I3 instead of 2! I, a circuit is established forthe A2 register relay 402 from ground through the contact of relay 2I3over the conductor 223, contact 2 of relay 400, winding of. the A2register, relay 402 to battery. A pulse associated with the alternatepulsing conductor I140 will operate relay 2I0 which establishes the samecircuit as relay 209 for operating relay 32I as traced. If this pulse isof a character to energize relay 2I2, ground is associated withconductor 225 which extends through contact 4 of relay 400 forenergizing the A5 register relay 404 to battery. When pulsing relay 2I4is energized, ground is associated with conductor 220 which extendsthrough contact 3 of relay 400 to the winding of the A4 register relay403 to battery. Each A register relay operated establishes a lockingcircuit through its alternate winding to ground on contact 4 of relay300. The above gives an example of the operation of the various registerrelays responsive to pulses which selectively operate the pulsing relays2| I, 2I2, 213 and 2I4. The digits are represented by numerals orletters and pulses are accordingly transmitted to effect the operationof certain registers in the following manner.

For this example it may be assumed that the three-digit code is 241 andtherefore that the A2 register relay 402 was operated by the first digitpulse.

After the pulses for a digit have been sent, the pulsing circuit isopened, causing the release of any of the pulsing relays 209 to 2I4,inclusive, which were operated to register the digit. The release of thepulsing relays after the first digit pulse opens the operating groundcircuit for relay 32I previously traced through contact I of relay 320,contact I or 4 of relay II3 to ground on the contacts of relay 209 or2I0. When this ground circuit is opened, relay 405 is energized inseries with relay 32I over a circuit which may be traced from batterythrough the winding of relay 32 l, winding of relay 405, contact 5 ofrelay 4I0, contacts 4 and 3 of relay. 32I to ground over conductor 230as previously traced on contact 3 of relay H3, The operation of relay405 opens the locking circuit for both relays 320 and 400, causing theirrelease. The operation of relay 405 associates relays 406, 401, 408 and409 of the sender B register with the pulsing relays 2| I, H2, 2 I 3 and2 I 4 so that the next series of pulses energize the relays of the Bregister in a selective manner according to the pulsing relaysenergized. The pulsing circuit and registers are now prepared forrecording the second digit.

The second digit again operates either relay 209 or 2I0, or both,depending upon whether the pulse is sent over lead I39 or I40. Theoperation of either or both relays associates ground through eitherconductor 220 or 224, or both, as previously traced. The conductorsextend through the contacts I and 4 of relay M3 to conductor 22L Sincerelay 320 is now released, the ground circuit extends through contact Iof the latter relay and contact I of relay 32I which is operated,winding of relay 322 to battery, which operates relay 322 and preparesthe steering circuit for a subsequent transfer of the pulsing circuit.Assuming that the second digit causes the operation of relay 2I4 forregistering the digit 4, theground is associated with conductor 220which extends through-contact 3 of relay 405, winding of the B4 registerrelay 408 to battery, operating this relay, which looks through itslower winding to ground on contact 4 of relay 300. After theregistration of this digit the pulsing relays are again released, whichdisconnects ground from the operating circuit which was traced for relay322. This relay, however, is held through a winding of relay M0 foroperating the latter relay. This circuit may be traced from batterythrough the winding of relay 322, winding of relay 4I0, contact 5 ofrelay 4I5, contacts 4 and 3 of relay 322 to ground over lead 230 aspreviously traced. Relay 4I0 is thus operated for associating thewindings of relays 4 to M4, inclusive, of register 0 with the pulsingcircuit. The operation of relay 4I0 causes the release of relays 405 and32I. When the pulses are received for the third digit, the energizationof either relay 209 or 2I0 again associates ground with conductor 22Iwhich extends through contact I of relay 320, released, contact I ofrelay 32I, released, contact I of relay 322, operated, winding of relay323 to battery, operating the latter relay.

Assuming that the third digit is I both relays 209 and 2I0 are operatedand pulsing relays 2I3 and 2I2 are operated to energize the C2 and C5register relays M2 and M4; Ground is therefore associated with leads223' and 225 which extend through contacts 2 and 4 of relay 4I0,windings of relays M2 and M4 to battery. Both register relays lookthrough their lower windings to ground on contact 6 of relay 300. Uponthe release of the pulsing relays ground is removed from lead 22I whichpermits relay M5 to operate in series with relay 323 in the mannerexplained for the preceding relays. The circuit'for relays M0 and 322 isthus opened, causing their release and relays 323 and. 415 remainoperated. Relay 4I5 associates the relays of register D with the pulsingrelay 2| I to 2I4, inclusive, for recording numerical code pulses orpulses for another office code, whichever is required to follow aftertakes place immediately after the last digit in a the office code hasbeen registered. When this call requires a trunk extending to anothertoll oflice, relay 326 is energized and when the call terminates withinthe area of this ofiice relay 321 is energized. The operation of relay326 arranges circuits for obtaining a routing in the marker for a tolltrunk and the operation of relay 321 arranges the circuit for obtaininga terminating trunk routing in the marker. Three-digit codes are usedfor either extensions to another tool oflice or to a terminating oliicewithin the area of the switching ofiice. A circuit for relay 326 isenergized from battery through the Winding of this relay to ground oncontact I of toll relay H0. The circuit for relay 321 is energized frombattery through its winding to contact I of relay III to ground oncontact I of relay IIO. It will be remembered that when a toll trunk isrequired relay H is operated and when a terminating trunk is requiredrelay III is operated and relay H0 is normal. After the last code digitis recorded relay 323 remains operated for a sufficient length of timeto establish a circuit for transferring the registrations to the markerby energizing relay 201. The circuit for relay 201 may be traced frombattery through its windings over lead 225, contact I of relay 223,contact 2 of relay 303, contact I of relay 326 when a toll trunk isrequired, contact I of relay 34l to ground on contact of relay 300. If aterminating trunk is required, the circuit, after passing throughcontact I of relay 323, is carried through contact 4 of relay 302,contact I of relay 326 which is then normal, contact I of relay 34I toground on contact I of'relay 300.

The operation of relay201 over a circuit as previously traced throughrelay 323. energizes relay 500 immediately after the third digit hasbeen registered. The circuit for relay 500 may be traced from batterythrough its winding, contact 3 of relay 302 or contact 4 of relay 303both of which are normal at this time. If relay 321 is operated for theselection of a completing trunk by the marker the circuit extends fromcontact 3 of relay 302, contact 3 of relay 321 to ground on contact 6 ofrelay 201. If, on the other hand, an extension is to be made to adistant toll oifice relay 321 is normal and relay 326 is operated.Consequently the circuit may be traced through contact 4 of relay 303,contact 3 of relay 326 to ground on contact ,5 of relay 201. Theoperation of relay 500 connects the contacts of the A registers MI, 402,403 and 404 to the windings of the A register relays in the marker. TheA register in the marker constitutes relays 600, 60I, 602 and 603. LeadAI extends through contact I of relay 500, contact I of relay 503,winding of the AI register relay 600 to battery. Lead A2 extends throughcontact 2 of relay 500, winding of the A2 marker register relay 60I tobattery. Lead A4 extends through contact 3 of relay 500, contact 2 ofrelay 503, winding of the A4 marker register relay 602 to battery. LeadA extends through contact 4 of relay 500, through the winding of the A5marker register relay 603. On a three-digit call relay 503 is notoperated and therefore the purpose of this relay will be explainedlater. Leads BI, B2, B4 and B5 are extended from the contacts of the Bsender register through contacts 5 to 8 respectively of relay 500,thence through contacts I to 4 of relay 504 which is normal and throughthe windings of the marker B register relays 604, 605, 606 and 601 tobattery. The CI, C2, C4 and C5 leads are extended from the C senderregister through contacts'9 to I2, inclusive, of relay 500, contacts Ito 4 of relay 505 which isnormal,

through the windings of the marker 0 registers 608, 609, BIO, 6H tobattery. It will be remembered that in giving this example of a three-digit oflice code the 'A register relay .402 was operated, VB registerrelay 408 was operated and C register relays M2 and M4 were operated.Ground is therefore connected through contact I of relay .402 to lead A2for operating the A2 marker register relay 60I. Ground through contact Iof relay 408 is connected to lead B4 for operating the B4 markerregister relay 606. Ground through contact I of relay M2 is connected tolead C2 for operating the C2'marker register relay 609 and groundthrough'contact l of the relay M4 is connected to lead C5 foroperatingthe C5 marker register relay 6| I. H V

The purpose of relay 504 is to register a zero in-the B marker registerwhen zerois the second digit of a three-digit code. A zero is registeredin the marker by the operation of the BI and. B4 relays 604 and 606,respectively. When a zero is recorded by the sender B register none ofth relays 406, 401,- 408 or 409 is operated.

This establishes a circuit for relay 504 from battery through its leftwinding, contact I4 of relay 500, contact l of register relay 406,contact 4 of register relay 401, contact 4 or register relay 408;contact 4 of register relay 409 to ground on contact 3 ofvrelay 300. Theoperation of relay 504 associates ground with lead GM for operat- Trunkgroups The marker register relays are operated in various combinationsfor'causing the operation of particular units, tens and fifties relaysin the marker as disclosed in detail in the aforementioned Patent2,236,246 to 'King-McKim-Myers, March 25; 1941, and need not bedescribed in detail in this application. .When a three-digit code isrecorded by the sender registers and transferred to the marker registersa particular group of units, tens and fifties relays are associated withthe registers. This'obtains' one of many route relays extending over tocompleting trunks when relay H8 is operated or to toll trunks to othertoll ofiices when this relay is normal. This of cours includes a largeplurality of groups of trunks extending to a large number of ofiices butit maybe known herein as the three-digit group of trunks. In a largetoll office there may not be sumcient routing paths which may be reachedby three-digit codes and consequently a separate group is necessarywhich may be reached by four-digit codes. In this type of toll ofiice afour-digit code associates the marker registers with a differentgroup'of fifties relays so that another'plurality of route relay 504trunks is reached through these relays.

telephone call to another toll oflice.

relays is reached through the latterfifties relays and consequentlyanother large group of toll This may be known herein as the four-digitgroup of trunks. Relay 6!! causes thetransfer from the three-digit groupof trunks to the four-digit group of trunks by associating a' differentgroup of fifties relays with the marker registers. A

third large plurality of trunks is used for fivedigit codeswhich may beknown herein as the five-digit code group of trunks. Relay 6H5 isoperated for the five-digit group which associates a third group offifties relays with'the marker A, B and Cregisterrelays. The lattergroup of fifties relays also has a third large plurality of route relaysassociated therewith for routing the five-digit code telephone calls tothe five-digit group of trunks.

Telephone call using four-digit code Four-digit codes are used only forextending a This call may originate inan associated tandem oflice or adistant toll office. The pulses are received in a similar manner to thatdescribed for the threedigit code with the exception that the'four-digitcode invariably starts with zero. For example,

a four-digit code may comprise the numerals 0532. The class registrationfrom the associated trunk operates relay to indicate that the call is tobe extended to another toll oflice. As previously traced, the circuitfor this relay is, from battery through its windingand contact 3,contact4 of relay H3 to ground on relay 2! 0. The preceding operationsof relays !4!, 20!, 202, 204 and 300 are the same as described for thetelephone call using athree digit code. After relay !!0 is operated acircuit is established for relay 326'which'is a toll call relay forguiding the energization of the start relays after the four-digit codehas been received. Relays !l2 and 203 are operated in a mannerpreviously described which cause the operation of relay 3 to disconnectthe class of call leads I36 and !3! from the pulsing relays 209 to 2!4,inclusive. Relays'320 and 400 are operated by ground on contact 3 ofrelay !!3 and relay 320 is operated to this same ground through contact2 of relay 320, An operating circuit for relay II! is established by theoperation of relay 328 extending from battery in the pulsing circuitover lead I40 throu h the winding of relay H! to ground on contact ofrelay 300. The operation of relay ll! connects the pulsing relays 209 to2!4, inclusive, to the pulsing circuit over leads I39 and I40. digitdialed from the distant oflice, none of the A register relays 40!, 402,403 or 404 is energized, since the first pulse does not energize any ofthe relays 2!!, 2I2, 2!3 or 2!4. Relay 2!0, however,

is operated on this first pulse which places ground on lead 22!, causingthe advance of the transfer relays and the advance from the A registerto the B register takes place. As will be remembered, this advance isaccomplished by the operation of relay 32! and relay 405. Upon theterminationv of the first pulse the operation of relay 405 releasesrelays 320 and 400. It may therefore be assumed at this time that relay32! is operated in the transfer group and relay 405 is operated forextending the pulsing circuit to the B register relays 406 to 409,inclusive. If the second digit to be recorded is 5, pulse relays 2!0 and2!2 are operated, which places ground on leads 225 and 22!.

Since zero is the first The ground on lead 225 extends through contact 4of relay 405, winding of B regtery, operating relay 323.

M6 to HQ with the pulsing relay contacts.

and 209 to energize. 209 associates ground with lead 22! extendingthrough contact of relay 320, contact of relay ister relay 409 tobattery, operating relay 409 which looks through its lower winding andcontact 3 to ground on-contact 4 of relay 300. The ground on lead 22!operates relay 322. Upon the release of the pulsing relays a transfertakes place for associating the C register relay with the pulsingcircuit. The release of relay 2!0 removes ground from lead 22! whichremoves the shunt from relay 4!0, causingthe operation of relay 4!0 frombattery through the winding of relay 322, winding of relay-410, contact5 of relay 415, contacts 4 and 3 of relay-322 over lead 230 whichextends to ground on contact 3 of relay !3. The operation of relay4l0opens the circuit for relays 32! and 405 which release. The pulse relaysare again operated for the third digit and assuming that this digit-is3, C register relays 4!! and M2 are operated. Consequently the incomingpulse would operate pulsing relays 209, 2!! and 2 I 3. The operation ofrelay 209 associates ground over lead 220 through contact I of relay!!3, lead 22!, contact of relay 320, contact of relay 32!, both of whicharenormal, contact of relay 322, which is operated, winding of relay 323to bat- Relays 322, 323 and M0 are therefore now energized. Pulse relay2! I associates ground with lead 222 and pulse relay 2!3 associatesground with lead 223. Lead 222 extends throughcontact of relay M0 forenergizing relay 4!! 'and'lead 323 extends through contact 2 of relay M0for energizing relay M2. These are the C! and C2 register relays whichare operated for recording the numeral 3. Both relays'lock through theiralternate windings to ground on contact 6 of relay 300. At the end 'ofthe third'pulse relays 209, 2!! and 2!3 release which removes theshuntfrom relay 4!5, causing its operation. The operating circuit forrelay 4|5 extends from battery through winding of relay 323, winding ofrelay 4! 5, contact '5 of relay 420, contacts 3 and 4 of relay 323, lead230 to ground on contact 3 ofrelay !!3. The operation of relay 4!5associates the D register relays It may be assumed that the fourth digitis represent-- ed by the numeral 2 which causes pulse relays 2 l 3 Theenergization of relay 32!, contact of relay 322, all of which have beenreleased, contact 2 of relay323 which is operated,

winding'of'relay 324 to battery, operating relay 324. The ground onthecontact of relay 2!3 extendsover lead 223 to contact 2 f relay 4!5, up-55 per winding of the D2 register relay 4!! to battery, operating thelatter relay. This relay locks through its lower winding and contact 3to ground on contact 6 of relay 300. The four digits have thus beenregistered.

Since no relays were operated in the A register a circuit wasestablished for the four-digit relay 303 which may be traced frombattery through its winding, contact of the A! register 40!,

contact 3 of the A2 register 402, contact 3 of the A4 register 403,contact 3 of the A5 register 404 to ground oncontact 3 of relay 300.Certain circuit combinations are arranged when relay 303 and toll relay326 are operated to indicate a four-digit call to the marker as willhereinafter be described. Also, a circuit is established at this timefor transferring the registrations from the sender registers B, Cand Dto the marker registers A, B and C. The fact that relay 324 was the lastof the transfer relays to operate also completes the four-digit circuitcombinations so that certain relays can operate. A circuit for relay 20!is established through the contact of relay 324 which may be traced frombattery through the winding of relay 20! over lead 255, contact I ofrelay 324, contact 2 of four-digit relay 303, contact I of relay 326,contact I of relay 343 to ground through contact I of relay 300.Acircuit is established for relay 6!! in the marker to associate themarker registers with particular fifties relays which associate theregister with route relays for selecting trunks used for four-digit tollconnections. This circuit may be traced from battery through the windingof relay 6!'!, contact I of four-digit relay 303 which is operated toground on contact I of the fivedigit relay 302 which is normal. Relay50! is operated to associate the sender registers B, C and D with themarker registers A, B andC. The circuit for relay 50! may be traced frombattery through its winding, contact 4 of fourdigit relay 303, contact 3of toll trunk relay 326 to ground on contact 5 of relay 201. It shouldbe noted that the foregoing circuit is traced through the contact of thefour-digit relay 303 and the contact of the toll relay 326 which must beoperated to establish this circuit.

'The contacts of the sender B relays 406, 401, 408 and 409 are newextended over leads BI,

B2, B4 and B5 through contacts I to 4 of relay 50!, conductors 63! to634 to the windings of the marker A register relaysAI, A2, A4 and A5. Ingiving this example it will be remembered that the sender register relay409 was operated for registering the numeral 5 and consequently theground is associated with the B5 lead which extends through contact 4 ofrelay 50!, winding of the A5 marker, register relay 603 to battery whichcauses the registration of the numeral 5 in the toll marker register.The contacts of the sender C registers 4!! to 4I4, inclusive, areextended over leads CI, C2, C4 and C5 through contacts 5 to 6,inclusive, of relay 50!, through the normal contacts of relay 504 overconductors 64!, 642, 643 and 644 to the windings of the toll marker Bregister relays. In this example the numeral 3 was registered whichassociates ground with the B! and B2 leads in the sender for operatingthe marker register relays 604 and 605. The contacts of the D senderregister relays are carried over leads DI, D2, D4 and D5 throughcontacts 9 to I2 of relay 50!, normal contacts of relay 505, conductors65!, 652,653 and 654, windings of the toll marker C register relay, tobattery. In this example the numeral 2 was registered in the sender andconsequently a ground is associated through contact I of relay 4!! withlead D2 for operating the toll marker C2 register relay 609. If a zeroshould have been registered in the C sender register in place of 3, theC sender register relays would have remained normal, but in all casesthe zero is recorded in the marker register by the operation of the and4 register relays. In this instance the zero registered in the C senderregister would record a zero in the toll marker B register by operatingthe B! relay 604 and the B4 relay 606. For this purpose a circuit isestablished for relay 504 extending from battery through its leftwinding, contact I4 of relay 50!, thence over lead 522 through contact Iof the C register relay 4II, contacts 4 of register relays 4I2, 4I3 andM4 to ground on contact 3 of relay 300. The operation of relay 504associates ground with leads 64! and 643 which extend through thewindings of relays 604 and 606 to battery, operating the B! and B4register relays for registering the 7 The five-digit code is againdifferent from the one, two, three and four-digit codes since thecharacter of the trunk routing must be given by signals to theregistering device ultimately receiving the call indication. To givethis call indication each of the first two digits of the fivedigit codeis ordinarily registered as one. This number is arbitrarily selected andother numbers may be used if so desired. An example of a five-digit codemay be assumed as 11648. Consequently, in response to the pulsestransmitted from a pulsing station or pulsing circuit the senderregister relays will be operated in the following manner. A registerrelay 40!, B register relay 40 6, C register relays 4!! and M4, Dregister relay 4I8, E register relays 42!, 422 and 424. r

The above registers the numerals 11648 on registers A to Econsecutively.

An idle incoming sender of the character disclosed is selected by theenergization of an incoming trunk such as I04 and the sender link andconnector circuit I65 in the manner previously described and relays ofthe sender are energized in response to this selection also aspreviously described. This includes the class. registration foroperating either relay H0 or III and the transfer of the pulsing relays209 to 2I4 from leads I36 and I3! to the pulsing leads I39 and I40.Relay H3 is operated to dissociate leads I36 and I3! from the pulserelays and relay II! is operated to associate pulse'leadsv I39 and I40with the pulsing relays. The operationof relay II3 also connects thecontacts of relays 209 and 2I0 to the armature of relay 320 aspreviously traced to operate the steering or progression relaysfortransferring the pulsing relay contacts from one sender register toanother. It will be remembered that relays 320 and 400 are originallyoperated over a circuit from battery through the windings of relays 320and 400, contact 5 of relay 405, contact I of relay 328, thence overlead 230 to ground on contact 3 of relay H3. The operation of relay 320associates ground from lead 230 through contacts 3 and 4 for maintainingthis circuit established and locking relays 320 and 400 operated. Acircuit 'isestablished from this ground through contact 2 of relay 320to operate relay 328, dissociating the original operating circuit fromrelays 320 and 400 so that they are maintained over the locking circuitthrough contacts 3 and 4 of relay 320. The operation of relays 320 and400 arranges the register circuit for receiving the first pulse. Sincethe first pulse is 1, relays 209 and 2!! are operated. Relay 209connects ground with lead 220 which extends through contact I of relayII3 to lead 22!, contact I of relay 320, winding of relay 32! tobattery, operating relay 32L The operation of the pulse relay 2! Iassociates ground with relay 322 which extends through contact I ofrelay 400 for energizing the A! register relay 40!. Relay 40! is lockedto ground on contact 4 of relay 300. When-the pulsing circuit is openedrelays 20! and 2!! release. The release of relay 209 dissociates groundfrom conductors 220 and 22! which removes the shunt from relay 405,permitting it tooperate in series with relay 32! as'previously traced.The operation of relay 405 opens the circuit for relays 320 and 400,causing their release, and associates the sender B register relays 406and 409 with the pulsing circuit.

Since the second pulse is I, relays 209 and 2 are again operated. Inthis instance ground is connected from relay 2II to lead 222, whichextends through contact I of relay 405 to operate the BI register 406,which locks to ground on contact 4 of relay 300. Ground from the contactof relay 209 in this instance is extended through contact I of relay320, contact I of relay 32I, winding of relay 322 to battery aspreviously described.

After the sender A and B registers have been operated a circuit isestablished for the five-digit relay 302 and also for the auxiliaryregister relay 428. The circuit for relay 428 extends from batterythrough its winding, contact I of A register relay 40I, contacts 3 of Aregister relays 402, 403 and 404 to ground, contact 3 of relay 300. Thecircuit for the five-digit relay 302 extends from battery through itswinding, contact I of relay 428, contact I of BI register relay 406,contacts 4 of- B register relays 401, 408 and 409 to ground on contact 3of relay300. The operation of the five-digit relay 302 established acircuit for a five-digit trunk group relay in the marker which iseffective whenever the marker is selected by i .the sender. This circuitmay be traced from battery through the winding of the marker fivedigittrunk group relay 6I6, contact 2 of relay 302, contact 3 of the normalfour-digit relay 303 to ground. It will be noted that the four-digitrelay 303 must be normal and the five-digit relay 302 operated in orderto complete this circuit.

The pulsing circuit continues to function in the manner previouslydescribed for setting the sender C, D and E register relays. After thefourth digit has been registered on the D registers relay 420 isoperated and when the pulsing relays are operated for registering thefifth digit, relay 325 is operated. After the fifth pulse has beencompleted and the pulsing circuit restored to normal a circuit isestablished through relay 325 for establishing the start circuit totransfer the code digit from the sender to the marker. This circuitenergized relay 201 through the contact of relay 325. This circuit maybe traced from battery through the winding of relay 201 over conductor255, contact I of relay 325, contact 4 of five-digit relay 302, contactI of relay 326, contact I of relay 34I to ground on contact I of relay300. For a five-digit call relay 321 is operated over a circuit frombattery through its winding, contact I of relay III to ground throughcontact I of relay H0. The operation of relay 201 therefore establishesa circuit for relay 502 from battery through its winding, contact 3 offive-digit relay 30 2, contact 3 of relay 321 to ground on contact 6 ofrelay 201. The

- operation of relay 502 now associates the contacts of sender registersC, D and E with the windings of the marker registers A, B and C. Sincethe numeral 6 was registered on the sender C, register relays 4H and 4I4were operated. This connects ground from contact 3 of relay 4i I withthe CI lead which extends through contact I of relay 502, contact I ofrelay 503, conductor 63!, winding of the marker AI register relay600 tobattery. The marker register relay 600' is thus operated and locked inthe manner described for the sender register relay. Ground is alsoconnected from contact I of relay M4 to lead C which extends throughcontact 4 of relay 502, lead 634, winding of the A5 register relay 603to battery, operating this register relay which locks in the mannerdescribed for the sender register relay. The'leads from the sender Dregister are connected through contacts 5 to 8, inclusive, of relay 502.Since the digit 4 was registered on the sender D register, ground isconnected through contact I of relay 4I8 to the D4 lead, through contactI of relay 502, contact 3 of relay 504, lead 643, winding of relay 606to battery. In the sender E register three relays El, E2 and E5 wereoperated to record the numeral 8. Consequently, ground is associatedwith leads EI, E2 and E5 from contacts I of relays MI, 422 and 424.These leads extend through contacts 9, I0 and I2, respectively, of relay502 which are carried through contacts I, 2 and 4 of relay 504, thenceover leads 65I, 652 and 654 for energizing the marker register relays608, 609 and BI I. The marker registers having been 0perated areassociated through the contacts of the five-digit relay 6I6 with aparticular group of units, tens and fifties relays which have theparticular group of route relays associated therewith and thereforeparticular trunks are selected when a five-digit call is registered.

The various trunk routes or trunk groups are shown diagrammatically inFig. 6 associated with the units, tens and fifties relays and routerelays for extending incoming calls to trunks over these routes. Theone, two and three-digit trunk groups are shown diagrammatically as atriangle 662, the four-digit trunk groups are shown diagrammatically asatriangle 665 and the fivedigit trunk groups are shown diagrammaticallyas the triangle 668. After registration of the three-digit code on themarker'registers A, B and C, ground is associated through the contactsof these registers with the units, tens and fifties relays 660 forenergizing a particular route relay 66I to obtain an idle trunk in thetrunk group 602. The contacts from the register relays are showndiagrammatically extending through the back contacts of the four-digitrelay SH and the five-digit relay 6I6 to the relays 660. When afour-digit code is registered on the marker registers A, B and C, relay6I1 is operated. Consequently the contacts of the registers areextending through the inner contact of relay 6I1 to the units, tens andfifties relays 663 for energizing a particular route relay to obtain anidle trunk in the trunk groups 665. A five-digit code register on themarker registers A, B and C obtains access to the five-digit trunksthrough the inner contact of the five-digit relay 6I6 which is energizedwhen a five digit code is registered. The contacts of the registerrelays are extended through the back contacts of relay 6I1, innercontacts of relays 6I6 to the units, tens and fifties relays 666 foroperating a particular route relay 661 to select an idle trunk in thefive-digit trunk groups 668.

After all of the digit pulses have been transmitted from the pulsingcircuit I01 to the sender, a terminating pulse is transmitted todisassociate the pulsing circuit I01 from the sender. As previouslystated, these pulses may include the digits for an oflice code which istransmitted to the marker registers and the digits for a second ofiicecode or numerical digits which may be transmitted over a terminatingtoll trunk. The number of sender registers operated depends upon thenumber of digits transmited and consequently the register following thelast register used for the digits is operated by the terminating pulse.This terminating pulse energizes pulse relays 2H and 2I4 representingthe numerals 1 and 4. This combination is chosen for a terminatingsignal since it isnot used for any digit,

Register relays 426 and 421 are operated by the terminating pulse whenall of the other registers have been taken for use. When all of theother registers have not been taken. for use the next successiveregister operates in the manner hereinafter described instead of theregisters 426 and 42?. Assuming that relay- 325 has been operated in theregular routine of registering digits and that this is the last regulardigit tobe registered, relay 330 would have been operatedwhen the pulseswere recorded on the register relays 42I to 424, inclusive. At thetermination of this pulse a circuit would have been established forrelay 425 from battery through the winding of relay 330, winding ofrelay 425, contact 2 of relay 330, lead 230 to ground oncontact 3 ofrelay H3. When the terminating pulse is received for operating relays 2Hand 2M, a ground is connected with lead 222 which extends throughcontact 3 of relay 425, winding of relay 426 to battery, operating relay4% which locks to ground on contact 3 of relay 300. Ground is alsoextended from relay 2I4 over lead 225, contact 2 of relay 425, windingof relay M1 to battery which operates relay 421 and locks this relay tothe same'ground as relay 426.. Ground from the contacts 2 of registerrelays 42B and 421 is connected through contacts 2 and 3 of out-pulsingrelay 3I4 for controlling the operation of steering relays 304 to 308and 3-I0 to 3I3 for sending out the pulses registered in any of theregisters after the office code registration is transferred to themarker. The outgoing pulses are transmitted after an outgoing trunk isselected in the manner fully described in the patent application of A.J. Busch and F. J. Scudder, Serial No. 295,012, filed September. 15,1939.

The operation of relays 2H and 2I4 also associates ground through theleft and right windings of relay 205 for operating the latter relay.Relay. 205 when operating establishes an obvious circuit for relay 206which looks to ground on contact 8 of relay 300. 'Relays 2H and 2l4 arereleased at the termination of the transmission of the last pulse whichcauses the release of relay 205. Since relay 206 remains operated acircuit is now established for relay 208 from ground on contact 8 ofrelay 300 through the contact of relay 206, back contact of relay 205,Winding of relay 208 to battery. Relay 208 establishes a locking circuitfor itself to ground on contact 8 of relay 300 and establishes anoperating circuit for relay H5. The latter circuit may be traced fromground on contact I of relay 208 through contact 3 of relay II 6,winding of relay H5 to battery. The operation of relay I I5 connectsbattery through resistance I22 to lead I40 and battery through the rightwinding of relay H4 to lead I39. Leads I39 and I40 extend through thewindings of a polarized relay in the pulsing circuit which is nowenergized to indicate to the pulsing circuit that the registers in thesender have satisfactorily operated for recording the digits astransmitted from the pulsing circuit. This polarized relay in operatingconnects ground to lead I39 which causes the energization of relay H4.The latter relay in operating associates its leftwinding in circuit withthe winding of relay H6 which extends to ground on contact 6 of relayH3. The operation of relay H6 opens the pulsing leads I39 and I40extending to the sender pulsing relays 209 to 2I4, inclusive, and causesthe release of relay H5. The operation of relay H6 and the release ofrelay H5 places resistances I24 and condense I across the pulsing leadsI39 and, I40 as a signal to. the pulsing operator or to anautomaticallyoperating pulsing circuit that the send'er has advanced and. cut off thepulsing circuit.

What is claimed is:

1. In a digit, registering system, aregistering device, a plurality ofindividual registers in said,

device, a plurality of individual registers in said registering deviceeach capable of variably registering digits, pulse responsive means,means in said registering device variably responsive to said pulseresponsive means for forming said individ ual registers into differentcombinations, each combination including different individual registers,a second registering device, and a plurality of means in said firstregistering device, equivalent in number to the number of possibleregister combinations for digit registrations, selectively operable inresponse to circuits established inthe registers S0 combined forconnecting the registers formed into said combinations withthe registersof said second registering device for setting the registers of saidsecond registering device.

3. In a digit registering system, a registering device, a series ofindividual registers in said registering device, each capable ofvariably registering digits, pulse responsivemeans, second and thirdregistering devices each having individual registers, means in saidfirstregistering device variably responsive to said pulse responsivemeans for variably forming different numbers of said individualregisters into different digit registering combinations, meansindividual to each combination so formed for connecting the registersformed into said combinations with the registers in said secondregistering device, and means in said first registering device foroperating the next in order-registers in said series following the lastregister formed into said combination for controlling the. registers ofsaid third registering device. 7

4. In a digit registering system, a sender having a plurality ofindividual code registers each capable of variably registering digits, amarker having a plurality of individual code registers less in numberthan the sender code registers each capable of variably registeringdigits, means in said sender responsive to pulses for operatingdiiTerent pluralities of said individual sender registers in successiveorder for registering different characters of oilice codes, saidplurality depending upon the number of digits in each character of code,and means in said sender selectively operable by said registrations forinvariably associating a number of said sender registers with saidmarker registers equivalent to the number of said marker registers. I

5. In a digit registering system, a sender having a plurality ofindividual registers each capable of variably registering digits, amarker having a plurality of individual code registers less in numberthan the sender code registers each capable of variably registeringdigits, means in said sender responsive to pulses for operatingdifferent pluralities of said individual sender registers insuccessiveorder for registering different characters of oiiice codes, saidplurality depending upon the number of digits in each character of code,and selectively operable devices in said sender responsive to saidregistrations for connecting a set number of the sender registers onwhich the code is registered with said marker registers, said senderregisters being combined in different orders to make up said set numberof registers dependent upon the number of digits registered in an officecode.

6. In a digit registering system, a sender having a plurality ofindividual registers each capable of variably registering digits, amarker having a plurality of individual code registers less in numberthan the sender code registers each capable of variably registeringdigits, means in said sender responsive to pulses for operatingdifierent pluralities of said individual sender registers in successiveorder for registering different characters of office codes, saidplurality depending upon the number of digits in each character of code,selectively operable devices in said sender responsive to saidregistrations for connecting a set number of the sender registers onwhich the code is registered with said marker registers, said senderregisters being combined in difierent orders to make up said set numberof registers dependent upon the number of digits registered in an ofiicecode, and means in said marker selectively responsive to the registersoperated in the sender for directing the operation of said marker forassociating the marker registers with difierent units of equipment.

7. In a digit registering system, a sender having a plurality ofindividual registers each capable of variably registering digits, amarker having a plurality of registers each capable of variablyregistering digits, a second sender having a plurality of registers eachcapable of variably registering digits, means in said first senderresponsive to pulses for operating different pluralities of saidindividual sender registers in successive order for registeringdifferent characters of oflice codes, said plurality depending upon thenumber of digits in each character of code, means for registering otherdigits on the next successive registers following the registers used forsaid oifice code, means in said first sender selectively operable bysaid registrations for connecting a set number of the sender registerson which the codeis registered with an equivalent number of registers inthe marker, and means for associating the next successive registersfollowing the registers used for said office code with said secondsender.

8. In a digit registering system, a sender having a plurality ofindividual registers each capable of variably registering digits, amarker having three individual registers. each capable of variablyregistering digits, means in said sender for registering oflice codes onthree, four or five of said individual registers, respectively, andmeans in said sender for connecting different combinations of three ofsaid sender registers with the registers of the marker for transferrinsaid respective oifice codes to the marker.

9. In a digit registering system, a sender having a plurality ofindividual registers each capable of variably registering digits, amarker having three individual registers each capable of variablyregistering digits, means in said sender for registering office codes onthree, four or five of said individual registers, respectively, andmeans in said sender for connecting different combinations of three ofsaid sender registers with the registers of the marker for transferringsaid respective ofiice codes to the marker, and means in said senderselectively operable by said registrations for directing the associationof the marker registers with three-digit, four-digit or five-digit trunkrouting equipment units.

10. In a digit registering system, a registering device having aplurality of individual code registers each capable of variablyregistering digits, a second register device having individual coderegisters less in number than the individual code registers in saidfirst registering device, pulse responsive means in said firstregistering device, means in said first registering device variablyresponsive to said pulse responsive means for setting all or part ofsaid plurality of individual code registers in said first registeringdevice, and means in said first registering device responsive to saidregister settings for connecting a number of said individual coderegisters with the individual registers of said second registeringdevice for transferring a code setting to the latter registers, thenumber of registers in the first registering device so connected beingnot greater than the number of registers in said second registeringdevice.

WALTER B. STRICKLER.

